Toggel breech mechanism for automatic firearms.



H. -JUHGHARDYTl TOGGLE BREEGH MEGHANlSM FOR AUTOMATIC FIREARMS.

APPL1cAT1oN FILED ocT. 21. 1912.

Patented July 27, 1915.

2 SHEETS-s112211.

Inventor.' .Per WM' 5,' y, 1 Attorney.

` H. BORCHARDT. -TOGGLE BREECH MECHANISM FOR AUTOMATIC FIREARMS.

APPLICATION FILED ocT. 21. I9I2.

1,147,780. PanalJuIy 2.7, 1915.

2 SHEETS-SHEET 2.

7467/7768365. y 1 [nire/fr' M170 omqrdf QS. Off/Lw. l M,

UNTTED STATES PATENT ortica.

HUGO BORCHARDIYOF CHARLOTTENBURG, GERMANY.

TOGGLE BREECH MECHANISM FOR AUTOMATIC FIREARMS. i

Specification of Letters Patent.

Patented July 27, 1915.

Application led October 21, 1912., Serial No. 726,962.

gle Breech Mechanism for Automatic Firearms, of which the following is a lspecification.

The invention relates to a toggle joint breech mechanism for automatic firearms with fixed barrels and more particularly relates to a device by means of which the toggle joint can be opened even when it is located in the extended position or even below it. This result is attained by the action of an inertia member which on recoil of the arm imparts to the toggle joint an initial breaking movement, either directly by act-A ing upon the middle hinge or indirectly by acting on one ofthe toggle levers provided with appropriate stops or abutments.

An embodiment of the invention is illus-v trated in the accompanying drawing by way of example.

Figure l shows the parts in the position of closure and Fig. 2 shows them after the initial breaking of the toggle joint has been produced.v Fig. 3 shows the rear portion of the firearm in side elevation partly in section with the breech mechanism in an intery mediate position partly opened.

The breech block lc is connected with the breech casing Z by means of a toggle joint a, Z). The breech closing spring f is inclosed in the breech casing on a rod e with collar c1, which rod is coupled with the rear toggle lever Z) by means of a chain g guided on a roller h.

In the embodiment of the invention illustrated in the drawing the inertia member oZ is a slide arranged behind the middle hinge (bending point) e of the toggle joint a, b and guided in the lateral wall of the breech casing Z. This member d is retained in the rearward inactive position by means of a spring (Z2 and it is provided with an obliqueV pressure face Z1 at its front end which cooperates with a lateral extension c1 of the middle hinge or of the rear joint lever b. 0n the recoil of the firearm the member d is displaced owing to its inertia so that its pressure face (ZL strikes the extension .c1 thereby imparting to the toggle joint an initial breaking movemont. The toggle joint is thereby thrown out of its locking position and is enabled to completely fold and to fully open the breech mechanism against the action of the breech closing spring f under the infiuence of the kinetic energy imparted to the toggle joint and to the breech block on recoil. v

The invention is not limited to the constructional form illustrated in the drawing.

What I claim as my invention and desire to secure by patent is 1. Breech mechanism for automatic firearms with fixed barrels comprising a breech block, a breech casing, a spring influenced toggle joint connecting said breech block with said breech casing and adapted to hold saidbre'ech block in the closed position, and an inertia member adapted to impart to said toggle joint an initial breaking movement on recoil of the arm, whereby said toggle joint is thrown out of its locking position and is enabled to completely fold and to fully open the breech mechanism under the influence of the kinetic energy imparted to said toggle joint and to said breech block on recoil.

2. Breech mechanismfor automatic firearms with fixed barrels comprising a breech block, a breech Casing, a spring influenced toggle joint connecting said breech block with said breech casing and adapted t o hold said breech block in the closed pos1- tion, and an inertia member coperating with said toggle joint and adapted to 1 mpart to saidl toggle joint an initial breaking .movement on recoil of the arm, whereby said toggle joint is thrown out of its locking position and is enabled to completely fold and to. fully. open the breech mechanism under the influence of the kinetic energy imparted to said toggle joint and to said breech block on recoil.

3. Breech mechanism for automatic firearms with fixed barrels comprising a breech block, a breech casing, a spring influenced togglev joint connecting said breech block with said breech casing and adapted to hold said breech block in the closed position, and an inertia member coperating with the middle hinge of said toggle joint and adapted to impart to said toggle joint an initial breaking movement qu recoil of the arm, whereby said toggle joint is thrown out of its locking position and is enabled to completely fold and to fully open the breech mechanism under the influence of the kinetic energy imparted to said toggle joint and to said breech block onrecoil.

4. Breech mechanism for automatic fire- 5 arms with fiXed barrels comprising a breech block, a breech casing, a spring influenced toggle joint connecting said breech block with said breech casing and adapted to hold said breech block in the closed position, a 1G projection on said toggle joint, and an inertia member adapted to act on said projection andl to impart to said toggle joint an initial breaking movement on recoil of the arm, whereby said toggle joint is thrown out of its locking position and is enabled to completely fold and to fully open the breech mechanism under the influence of the kinetic energy imparted to said toggle joint and to said breech block on recoil.

5. Breech mechanism'for automatic rearms with fiXed barrels comprising a breech block, a breech casing, a spring influenced toggle 4joint connecting said breech block with said breech casing and adapted to hold said breech block in the closed position, a

projection on the middle hinge of said toggle joint, and an inertia member adapted to act on said projection and to impart to said toggle joint an initial breaking movement on recoil of the arm,.whereby said toggle joint is thrown out of its locking positionand is enabled to completely fold and to fully open the breech mechanism under the block, abreech casing,

toggle joint connecting said breech block 4 with said breech casing and adapted to hold said breech block in the closed position, and a spring iniiuenced inertia member adapted to impart to said toggle joint an initial breaking movement on recoil of the arm whereby said toggle joint is thrown out of its locking position and is enabled to coin- `pletely fold and to fully open the breech mechanism under the influence of the kinetic energy imparted to said toggle joint and to saidbreech block on recoil.

7. Breech mechanism for automatic firearms with Xed barrel comprising a breech a spring influenced toggle joint between said breech block and said breech casing, a projection on the middle hinge of said toggle joint, and an inertia member having an inclined front face adapted to act on said projection and to break said toggle joint on rrecoil of the arm.

In-testimony whereof I aiiiX my signature in presence of two witnesses.

HUGO BORCHARDT. Witnesses: A

ROBERT MlCHALsKI, HENRY HASPER. 

